Help finding a B tree Example

Hello, im currently working in an implemention of a B tree that works on disc a not on memory, but i want to find a good simple example of a B tree in c# ( a normal one that work o memory) that i can use as base to create mine, some know some good example of code that are not extremly complicated(i undestarn c# to an extend but i have only had found example that go beyong what i understan or what i need), some b tree example i have found for reference https://github.com/rdcastro/btree-dotnet, thanks.